ClipArt ETC
"Scales from the wings of a butterfly, <i>Vanessa antiopa</i>, highly magnified. 1. from border of anterior wing, above; 2. from border of anterior wing, below." -Whitney, 1889.

Scales from the Wings of a Butterfly

"Scales from the wings of a butterfly, Vanessa antiopa, highly magnified. 1. from border of anterior…

"A draftsman's instrument for ruling parallel lines. It consists of a triangle so attached to a straight-edge that it can be moved back and forth on it a distance predetermined by the adjustment of a set-screw. a, a straight-edge; b, triangle moving on <i>a</i> for a distance determined by the set of the micrometer scale <i>c</i>; d, spring for releasing triangle and keeping it in the end of its slot." -Whitney, 1889

Section Liner, A Draftsman's Tool

"A draftsman's instrument for ruling parallel lines. It consists of a triangle so attached to a straight-edge…

<i>Pristis pectinatus</i>. "1. An elasmobranchiate or selachian fish of the family <i>Pristidae</i>, having the snout prolonged into a flat saw or serra beset on each side with horizontal teeth pointing sidewise." &mdash;Whitney, 1889

Sawfish, View from Underneath

Pristis pectinatus. "1. An elasmobranchiate or selachian fish of the family Pristidae, having the snout…

"A propeller acting on the principle of the screw, attached to the exterior end of a shaft protruding through the hull of a vessel at the stern. It consists of a number of spiral metal blades either cast together in one piece or bolted to a hub... C, cross section of blade, on larger scale." -Whitney, 1889

Screw Propeller, Cross Section of a Blade

"A propeller acting on the principle of the screw, attached to the exterior end of a shaft protruding…

<i>Cyclodus gigas</i>. "They are harmless creatures, some inches long, natives mostly of warm countries, will small, sometimes rudimentary limbs, and generally smooth scales." &mdash;Whitney, 1889 <p>This illustration features a skink crawling on rocks with grass in the background.

Skink, Giant Cyclodus

Cyclodus gigas. "They are harmless creatures, some inches long, natives mostly of warm countries, will…

"Under Louis XV, and Louis XVI, the sou was struck in copper, and had an intrinsic value of two deniers twelve grains, though retaining the conventional value of twelve deniers, and this coinage continued until the adoption of the existing decimal system in 1793." &mdash;Whitney, 1889 <p>This illustration shows the reverse of the coin, on which is displayed an oak wreath with a scale.

French Sou from 1793, Reverse

"Under Louis XV, and Louis XVI, the sou was struck in copper, and had an intrinsic value of two deniers…

"An instrument for measuring the radii of spheres; a sphere-measurer. It is of especial service to opticians in determining focal lengths, etc. of lenses. The common form consists of a vertical screwc, with a large graduated head a, a, turning in a socket supported by three legs whose hard steel points are exactly equidistant. The fixed scale b at the side, together with the graduated screwhead, makes it possible to measure with great accuracy the distance between the extremity of the screw and the plane passing through the ends of the three supports, when, for example, all the points are in contact with the surface of the sphere." &mdash;Whitney, 1889

Spherometer

"An instrument for measuring the radii of spheres; a sphere-measurer. It is of especial service to opticians…

"A form of balance in which the weight of the body under examination is measured by the stretching (torsion) of an elastic wire in the form of a long spiral. A common use of the simple form of spiral balance is in determining the specific gravity of small fragments of minerals, which for this purpose are weighed first in the upper pan and then in that below, which is immersed in water." —Whitney, 1889

Spiral Balance

"A form of balance in which the weight of the body under examination is measured by the stretching (torsion)…

"A contrivance for measuring the extreme differential capacity of the human lungs. The instrument most commonly employed consists on an inverted chamber submerged in a water bath. The breath is conducted by a flexible pipe and internal tube so as to collect in the chamber, which rises in the water, and is fitted with an index which marks the cubic inches of air expired after a forced inspiration...a, is a small gas-holder containing an inverted vessel a'; b, index which shows on the scale c the number of cubic inches expired; d, manometer, which, when a' is held down, shows the pressure which the lungs can exert; e, plug-vent for outlet of the expired air; f, cock for outlet of water; g, tube through which the expiration is made." &mdash;Whitney, 1889

Spirometer

"A contrivance for measuring the extreme differential capacity of the human lungs. The instrument most…